feat(panel): add Insert as FX — ReaSampler 9000 onto the selected track, preloaded with the focused capture, over the existing instrument-drop body

src/shell/actions/insert_fx_action.cpp

@@ -0,0 +1,54 @@
+// insert_fx_action.cpp — see insert_fx_action.h. main.cpp owns the API pointers; this TU
+// gets them extern via the WANT list.
+
+#include "shell/actions/insert_fx_action.h"
+
+#include <cstdint>
+#include <string>
+#include <vector>
+
+#include "core/ui/insert_fx_enable.h"           // the refusal fold + its wording
+#include "core/wire/instrument_drop.h"          // buildInstrumentDropPreset — the pure payload
+#include "shell/actions/instrument_drop_win.h"  // performInstrumentDrop — the shared drop body
+#include "shell/panel/panel_bank_ops.h"         // bankPanelSelectedSampleIds
+
+#include "reaper_plugin.h"
+
+#define REAPERAPI_MINIMAL
+#define REAPERAPI_WANT_GetSelectedTrack
+#define REAPERAPI_WANT_ShowConsoleMsg
+#include "reaper_plugin_functions.h"
+
+namespace reasampler {
+
+namespace {
+
+void report(const std::string& sentence) {
+    if (ShowConsoleMsg) ShowConsoleMsg(("ReaSampler: " + sentence + "\n").c_str());
+}
+
+}  // namespace
+
+void doInsertAsFx() {
+    const std::vector<std::string> selected = bankPanelSelectedSampleIds();
+    // seltrackidx 0 = the FIRST selected track, master excluded (SDK header) — the same
+    // "the selected track" the Media-Explorer ingest surface targets. A multi-track
+    // selection therefore loads onto the first, rather than refusing or fanning out.
+    MediaTrack* track = GetSelectedTrack ? GetSelectedTrack(nullptr, 0) : nullptr;
+
+    const ui::InsertFxRefusal refusal =
+        ui::insertFxRefusal(static_cast<int>(selected.size()), track != nullptr);
+    if (refusal != ui::InsertFxRefusal::None) {
+        report(ui::insertFxRefusalMessage(refusal));
+        return;
+    }
+
+    // performInstrumentDrop opens its own undo block (one Ctrl-Z) and rolls the FX back
+    // itself if the preset never applies — there is nothing here to group with it, so no
+    // second block is opened around it.
+    if (!performInstrumentDrop(track, wire::buildInstrumentDropPreset(selected.front())))
+        report("could not add ReaSampler 9000 to the selected track -- check the plug-in "
+               "is installed and scanned");
+}
+
+}  // namespace reasampler